121368978 has 24 divisors (see below), whose sum is σ = 263685708. Its totient is φ = 40345632.

The previous prime is 121368971. The next prime is 121368983. The reversal of 121368978 is 879863121.

It can be written as a sum of positive squares in 2 ways, for example, as 108430569 + 12938409 = 10413^2 + 3597^2 .

It is not an unprimeable number, because it can be changed into a prime (121368971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2325 + ... + 15752.

Almost surely, 2^121368978 is an apocalyptic number.

121368978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121368978 is an abundant number, since it is smaller than the sum of its proper divisors (142316730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121368978 is a wasteful number, since it uses less digits than its factorization.

121368978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18458 (or 18455 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 121368978 is about 11016.7589607833. The cubic root of 121368978 is about 495.1109882744.

The spelling of 121368978 in words is "one hundred twenty-one million, three hundred sixty-eight thousand, nine hundred seventy-eight".